Effects of herbicides on two submersed aquatic macrophytes, Potamogeton pectinatus L. and Myriophyllum sibiricum Komarov, in a prairie wetland

canada clopiralid clopyralid efectos secundarios effet secondaire fitotoxicidad fleur floraison flores flowering flowers growth rate herbicidas herbicide herbicides land malezas mauvaise herbe myriophyllum nontarget effects phytotoxicity picloram piclorame picloran potamogeton saskatchewan side effects taux de croissance terre terre humide tierras tubercule tubers weeds wetlands